8 Rockwell Automation Publication 440R-RM003A-EN-P - July 2021
Chapter 1 Introduction
GSR Benefits The GSR family of safety relays provides the following benefits:
• One or two (dual-channel) inputs
• Single wire safety (SWS) expansion
• Narrow package (less panel space)
• Configurable operation
• Cat 4 PLe and SIL 3 rating on most models
• RoHS compliance
Conversion Concerns Product obsolescence is a part of the industrial business cycle. This publication
provides cost-effective recommendations for converting your MSR family of
safety relays to the state-of-the-art GSR family, and considers the following
major concerns.
Panel Space
Many control panel designers leave space in their panels for future expansion
and improvements. Panel space can become tight as the extra space is used.
With panel space in mind, the recommended conversion is intended to
maintain, or even reduce, panel space.
Wiring Terminal Location
The need to move a wire from the top of the old device to the bottom of the new
device in a control panel cannot be taken lightly. Each of the recommended
conversions shows the terminal locations of the old and new devices, so you
can plan the conversion appropriately.
Wiring Change
Example schematics are provided that compare the older device and the
recommended newer device for each of the applications that the older device
can provide.
Response Time
Response time is the time that is required to perform the safety function. For
each conversion, the comparable response time is provided. An increase in the
response time requires you to adjust the safety distance. This increase is not as
much of an issue when a safety gate must be opened manually. However, this
additional response time is likely to be an issue when presence-sensing devices
like light curtains and safety mats are used.
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